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msp430f233 I2c调试请教

admin admin1
Expert 1365 points

我在使用msp430与eeprom进行通信，430为master，使用1Mhz内部DCO主频，然后，因为后期需要将主频提高到12Mhz，所以做了一些修改，发现，修改后i2c写入e2rom成功，读取失败。请教一下，谢谢~

  • 0
    Expert 1365 points 
    读程序
    uint8 eeprom_read(uint8 addr1st,uint8 addr2st,uint8 *pword_val)
{
UCB0CTL1 |= UCTR;//write
UCB0CTL1 |= UCTXSTT;
UCB0TXBUF=addr1st;
  while(!(IFG2 & UCB0TXIFG))
  {
     if(UCB0STAT & UCACKIFG)
        return 1;
  }    
UCB0TXBUF=addr1st;
  while(!(IFG2 & UCB0TXIFG))
  {
     if(UCB0STAT & UCACKIFG)
        return 1;
  }  
  UCB0CTL1 &= ~UCTR;//READ
  UCB0CTL1 |= UCTXSTT;
while(UCB0CTL1 & UCTXSTT);
UCB0CTL1  |= UCTXSTP;
while(UCB0CTL1 & UCRXIFG);
*pword_val=UCB0RXBUF;
while(UCB0CTL1 & UCTXSTP);
return 0;

}
  • 0 回复 admin admin1
    Guru 67475 points

    用逻辑分析仪或者示波器看过时序了吗？